CN110143844B - Deposit control in methanol to olefins processes - Google Patents
Deposit control in methanol to olefins processes Download PDFInfo
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- CN110143844B CN110143844B CN201810143522.5A CN201810143522A CN110143844B CN 110143844 B CN110143844 B CN 110143844B CN 201810143522 A CN201810143522 A CN 201810143522A CN 110143844 B CN110143844 B CN 110143844B
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- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
- C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P30/00—Technologies relating to oil refining and petrochemical industry
- Y02P30/20—Technologies relating to oil refining and petrochemical industry using bio-feedstock
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
Methods of reducing deposit formation, accumulation, or a combination thereof in an MTO process are disclosed. The method includes adding an anti-fouling composition to a reactor effluent stream comprising olefins, unreacted oxygenates, and water; a quench tower; a bottoms stream from the quench tower; an oxygenate recovery tower; or a combination thereof. The anti-fouling composition comprises a dispersant, an inhibitor, or a combination thereof, the dispersant comprising a polyether, a fatty acid amide, an organic sulfonic acid-based compound, or a combination comprising at least one of the foregoing; and the inhibitor includes a hydroxybenzene.
Description
Background
Light olefins such as ethylene and propylene have been widely used in the chemical industry. Conventionally, ethylene and propylene are produced from naphtha, ethane, or other hydrocarbons by steam (stream) cracking. As an alternative resource for olefins, MTO processes have been developed that convert methanol to olefins. And methanol can be produced from coal or natural gas.
Although the MTO process offers the possibility of producing ethylene and propylene at lower cost for areas with abundant coal reserves but where low cost ethane is readily available, it has been found that side reactions may occur in the MTO process, producing solids that may precipitate out of the product stream or various other streams produced during the process. The precipitate from the side reactions may clog the process equipment and reduce the heat transfer capacity of the heat exchanger and reboiler. If there are excessive deposits, the factory needs to be curtailed from production or shut down for cleaning, and therefore, lost production.
Despite extensive research in the art, efficient chemical treatments for deposit control in MTO processes are not available. For example, chemical treatments that are active in other processes may result in more deposit formation/accumulation in the MTO process rather than solving the deposit problem. Accordingly, methodologies continue to be sought that are effective in controlling deposit formation and/or accumulation in MTO processes.
Disclosure of Invention
Methods of reducing deposit formation, accumulation, or a combination thereof in an oxygenate to olefin process are disclosed. The method includes adding an anti-fouling composition to a reactor effluent stream comprising olefins, unreacted oxygenates, and water; a quench tower; a bottoms stream from the quench tower; an oxygenate recovery tower; or a combination thereof. The anti-fouling composition comprises a dispersant, an inhibitor, or a combination thereof, the dispersant comprising a polyether, a fatty acid amide, an organic sulfonic acid-based compound, or a combination comprising at least one of the foregoing; and the inhibitor comprises a hydroxybenzene.
A method of recovering unreacted oxygenate with reduced deposit formation, accumulation, or a combination thereof includes passing a reactor effluent stream comprising olefins, unreacted oxygenate, and water to a quench tower to produce an overhead stream comprising olefins and a bottoms stream comprising unreacted oxygenate and water; adding an anti-fouling composition to a reactor effluent, a quench tower, a bottoms stream from the quench tower, an oxygenate recovery tower, or a combination thereof; and separating the unreacted oxygenate from the water, wherein the anti-fouling composition comprises a dispersant, an inhibitor, or a combination thereof, the dispersant comprising a polyether, a fatty acid amide, an organic sulfonic acid based compound, or a combination comprising at least one of the foregoing; and the inhibitor comprises a hydroxybenzene.
A process for producing olefins from recycled oxygenates with reduced deposit formation, accumulation, or a combination thereof comprises reacting recycled oxygenates in an oxygenate to olefin conversion reactor in the presence of a catalyst to produce a reactor effluent stream comprising olefins and unreacted oxygenates; passing the reactor effluent stream to a quench tower to produce an overhead stream comprising olefins and a bottoms stream comprising unreacted oxygenates and water; separating unreacted oxygenate from water in an oxygenate recovery tower to provide recycled oxygenate; and adding an anti-fouling composition to the reactor effluent stream, the quench tower, a bottoms stream from the quench tower, the oxygenate recovery tower, or a combination thereof, wherein the anti-fouling composition comprises a dispersant comprising a polyether, a fatty acid amide, an organic sulfonic acid compound, or a combination comprising at least one of the foregoing, an inhibitor, or a combination thereof; and the inhibitor comprises a hydroxybenzene.
Drawings
The following description should not be taken as limiting in any way. Referring to the drawings, like elements are numbered alike:
FIG. 1 is a simplified diagram illustrating an exemplary chemical treatment for controlling deposit formation and/or accumulation in an MTO process;
FIG. 2 depicts outlet temperature versus time for a reboiler for an oxygenate recovery tower for demonstrating the effect of using an anti-fouling composition as depicted herein;
FIG. 3 depicts overhead pressure versus time for an oxygenate recovery tower for demonstrating the effect of using an anti-fouling composition as depicted herein;
FIG. 4 depicts pressure differential versus time for an oxygenate recovery tower for demonstrating the effect of using an anti-fouling composition as depicted herein; and
fig. 5 depicts the outlet temperature of a wastewater stream separated from oxygenates after passing through a heat exchanger as a function of time for demonstrating the effect of using an anti-fouling composition as described herein.
Detailed Description
The inventors have found that the anti-fouling composition as described herein can be used to reduce deposit formation and/or accumulation encountered in processes for converting oxygenates to olefins such as ethylene and propylene. In particular, the anti-fouling composition is effective for reducing deposit formation and/or accumulation during the oxygenate recovery stage. Advantageously, the anti-fouling compositions are water soluble and stable at high temperatures, and therefore, they are compatible with the various effluent streams produced in the MTO process and can be used under a variety of process conditions. As used herein, deposit formation includes the formation of undesired materials and their precipitation as a deposit.
The anti-fouling composition comprises a dispersant, an inhibitor, or a combination comprising at least one of the foregoing. The dispersing agent comprises polyether, fatty acid amide or organic sulfonic acid compound. Combinations of the above dispersants may be used. In embodiments, the anti-fouling composition has a solubility in water of greater than about 100g/L, greater than about 200g/L, or greater than about 300g/L at 23 ℃.
Exemplary polyethers include polyethylene glycol, polypropylene glycol, polyethylene polypropylene glycol, and the like. Combinations of the foregoing polyethers may be used.
As used herein, organic sulfonic acid-based compounds include organic sulfonic acids, and salts and esters thereof. The organic sulfonic acid compound may be an alkyl or aryl sulfonic acid, a salt or ester of an alkyl or aryl sulfonic acid, an aromatic sulfonic acid polymer or a salt or ester of an aromatic sulfonic acid polymer. In particular, the organic sulfonic acid compound may be C 6-30 Arylsulfonic acid, aromatic sulfonic acid polymer, C 6-30 Salts of arylsulfonic acids, salts of aromatic sulfonic acid polymers, C 6-30 C of aryl sulfonic acid 1-20 C of alkyl ester or aromatic sulfonic acid polymers 1-20 Alkyl esters. Exemplary organic sulfonic acid compounds include C 10-14 Or C 10-13 Linear alkylbenzenesulfonic acid, C 10-14 Or C 10-13 Salts of linear alkylbenzene sulfonic acids, dodecylbenzene sulfonic acids, sodium salts of dodecylbenzene sulfonic acids or polystyrene sulfonates. Combinations of the above materials may be used.
Suitable fatty acid amides are those derived from fatty acids and amines. Exemplary fatty acid amides include N, N-dialkylamides having the formula,
wherein R is 1 And R is 2 Independently C 1-4 An alkyl group, and R 3 Is C 9-30 Alkyl or C 9-30 An alkenyl group. Preferably R 1 And R is 2 Is methyl and R 3 Is C 12-25 An alkenyl group. Combinations of the above fatty acid amides may be used.
The inhibitor may be dihydroxybenzene of the formula
Wherein each occurrence of R is independently C 1-10 Alkyl, C 5-12 Aryl, amino or carboxylic acidEster/radical; and m is 0 to 4 such that at m less than 4, the valence state of each carbon of the ring is filled with hydrogen. In an embodiment, m is 0. In another embodiment, m is 1 or 2, and each occurrence of R is independently methyl or tert-butyl.
The anti-fouling composition may include both a dispersant and an inhibitor, such as the polyethers and dihydroxybenzenes described herein. The weight ratio of dispersant to inhibitor may be from about 1:10 to about 10:1, from about 1:5 to about 5:1, or from about 1:3 to about 3:1.
Chemical treatments as described herein are effective to increase the reliability of MTO processes and provide a cost-effective solution for controlling deposit formation and/or accumulation. Generally, a process for producing olefins includes producing olefins from an oxygenate in an oxygenate to olefin reactor, quenching a reactor effluent stream in a quench tower, and recovering unreacted oxygenate from the quench tower bottoms stream in an oxygenate recovery tower.
As used herein, oxygenates include methanol, dimethyl ether, or a combination thereof. Both recycled oxygenates and fresh oxygenates can be used. The oxygenate may be derived from coal, natural gas, or a combination thereof. If desired, the methanol may first be at least partially converted to dimethyl ether in a catalytic reactor and then fed to an oxygenate to olefin reactor.
The reaction conditions for converting an oxygenate to an olefin and the conversion reactor are known in the art and are not particularly limited. The reaction temperature may be 200℃to 700 ℃. The catalyst used includes a molecular sieve catalyst. Exemplary molecular sieve catalysts include one or more zeolite catalysts and/or one or more SAPO catalysts, such as SAPO-34. The molecular sieve catalyst typically also includes a binder material, a matrix material, and optionally a filler. Suitable matrix materials include clays, such as kaolin. Suitable binder materials include silica, alumina, silica-alumina, titania and zirconia.
The reactor effluent stream produced by the oxygenate to olefin reactor and comprising unreacted oxygenate, water and olefins is then quenched in a quench tower. The reactor effluent stream may also comprise acid. The caustic stream, if present, is fed to a quench tower to neutralize these acids. The quench tower produces a top stream and a bottom stream. The overhead stream contains olefins, which can be further processed downstream by known methods. The bottoms stream contains unreacted oxygenate and water. The bottoms stream may also contain residual olefins. In embodiments, a portion of the bottoms stream from the quench tower is recycled to the upper portion of the quench tower in order to improve the efficiency of the quench tower.
Optionally, a second quench tower is used. The stream from the first quench tower is fed to a second quench tower to produce a top stream comprising olefins and a bottom stream comprising unreacted oxygenate and water. The caustic stream may also be added to the second quench tower. The overhead streams from the quench tower may be combined and further processed to provide the desired olefins. The bottom streams from the quench columns are also combined. The combined bottom stream is recycled to the quench tower, or sent for further processing, or fed to an oxygenate recovery tower.
The bottom stream from the quench tower may contain undesirable material carried over from the upstream reactor. During the oxygenate recovery stage, new impurities may also be formed from unreacted oxygenate and residual olefins (if present). The entrained material and newly formed impurities are poorly soluble in water and therefore they may precipitate out of the process stream forming a deposit that may accumulate over time. If deposits form and accumulate in the reboiler, the heat transfer capacity of the reboiler may be reduced. In addition, the reboiler outlet temperature may also be reduced. Eventually, the reboiler needs to be shut down and cleaned. If deposits form and accumulate in the oxygenate recovery tower, the pressure differential across the oxygenate recovery tower may increase and the efficiency of separating the oxygenates from the water may decrease. In other words, formation and accumulation of deposits, if not controlled, may reduce oxygenate recovery efficiency. Eventually, the oxygenate recovery tower needs to be shut down for cleaning due to reboiler failure and reduced separation efficiency. Insufficiently cooled wastewater may have safety problems if deposits form and accumulate in the heat exchangers used to cool the wastewater.
The inventors have found that the anti-fouling compositions disclosed herein are effective in significantly slowing deposit formation and/or accumulation. The anti-fouling composition may be added to the reactor effluent stream, the quench tower, the bottoms stream from the quench tower, the oxygenate recovery tower, or a combination thereof.
In embodiments, the bottoms stream from the quench tower(s) is combined with an anti-fouling composition as disclosed herein. The anti-fouling composition may be added to the bottom stream from the quench tower(s) and then the stream is fed to the oxygenate recovery tower. Alternatively or additionally, the anti-fouling composition and the bottoms stream from the quench tower(s) may be added separately to the oxygenate recovery tower. The volume ratio of the anti-fouling composition relative to the bottoms stream from the quench tower(s) fed to the recovery tower is from about 1:1,000,000 to about 3:1,000, preferably from about 1:100,000 to about 2:10,000, more preferably from about 1:1,000,000 to about 1:1,000.
At the oxygenate recovery tower, unreacted oxygenates are separated from the water to avoid environmental problems and for recycling the oxygenates. Typically, the overhead stream is an oxygenate stream comprising unreacted oxygenate and the bottoms stream is a stream comprising primarily water. The separated water is cooled using a series of heat exchangers and sent to wastewater treatment. The recycled oxygenates can be reused in the MTO process.
As described above, the formation and accumulation of deposits in the oxygenate recovery tower may increase the tower pressure differential and reduce the oxygenate recovery efficiency, which means that less oxygenate is recovered from the overhead stream. When the reboiler is used to heat the oxygenate recovery tower, the process stream is withdrawn from the recovery tower as a heat source. As mentioned above, precipitation of the deposit may significantly reduce the heat transfer capacity of the reboiler. The reboiler outlet temperature decreases as deposits form and accumulate in the reboiler. The formation and accumulation of deposits in the heat exchanger may reduce the efficiency of the heat exchanger. The outlet temperature of the waste water exiting from the heat exchange may be higher than desired.
The inventors have found that the reboiler efficiency is improved after use of the anti-fouling composition as disclosed herein. The reboiler outlet temperature is also more stable than before chemical treatment. Furthermore, the inventors have found that by using an anti-fouling composition as disclosed herein, the efficiency of a heat exchanger for cooling wastewater can be maintained for a long period of time, which indicates an increased heat exchanger run time. The performance and reliability of the oxygenate recovery tower is also improved. The pressure difference is thus more stable. And more oxygenate can be recovered from the top of the column.
Fig. 1 is a simplified diagram illustrating an exemplary chemical treatment for controlling deposit formation and/or accumulation in an MTO process. The recycled oxygenate 32 is pumped into the oxygenate to olefin reactor 10 along with optional fresh oxygenate 11. At reactor 10, oxygenates are converted into olefins, particularly light olefins such as ethylene and propylene. If desired, the reaction conditions (including the choice of catalyst) may be adjusted according to known methods so that the desired olefin product may be selectively produced. A reactor effluent stream 12 comprising olefins and unreacted oxygenates and water is fed to a quench tower 20. At the quench tower 20, light hydrocarbons, such as olefins, escape from the top of the quench tower as a hydrocarbon stream 22. The oxygenates and water are condensed and made into a bottoms stream 21. A portion of bottoms stream 21 is returned to the upper portion of quench column 20 as stream 24. Another portion of the bottoms stream 21 is fed to an oxygenate recovery column 30 where unreacted oxygenate is recovered as a top stream 32 and water is condensed as a bottoms stream 31. A portion of the bottom stream 31 is heated at reboiler 33 and then fed to the oxygenate recovery column 30. Another portion of the bottom stream 31 is passed through a heat exchanger 34 to provide cooled wastewater 35.
An anti-fouling composition as disclosed herein can be injected into the bottoms stream 23 to control deposit formation and/or accumulation. The anti-fouling composition and the bottom stream 23 may also be introduced separately to the oxygenate recovery tower 30. Alternatively or additionally, an anti-fouling composition may be added to the reactor effluent stream 12 or the quench tower 20.
The inventors have found that the anti-fouling composition as disclosed herein can effectively slow down or prevent deposit formation and/or accumulation. As described herein, the reboiler 33 cannot be operated effectively when deposits are formed and accumulated in the reboiler 33. The outlet temperature of reboiler 33 will be low. At the same time, the oxygenate recovery tower pressure differential becomes unstable. Recovery of oxygenates from the oxygenate recovery tower 30 will be reduced. The reboiler outlet temperature, stability of the pressure differential of the oxygenate recovery tower, and the overhead pressure of the oxygenate vapor can thus be used to evaluate the performance of the anti-fouling composition. If the anti-fouling composition is functional, the reboiler outlet temperature can be maintained at a significantly higher temperature. The pressure differential across the oxygenate recovery tower will be more stable with less fluctuation. The overhead pressure of the oxygenate recovery tower should be significantly higher as more oxygenate is recovered. The wastewater temperature of stream 35 can also be used to evaluate the efficiency of deposit control. If the sediment is precipitated in the heat exchanger 34, the outlet temperature of the waste water 35 will have a significantly higher temperature, because the heat exchanger 34 does not remove heat from the waste water 31 effectively.
Two experiments were performed. No anti-fouling composition was used during the first test. The first trial was stopped because of other process infrastructure problems. During the second test, an exemplary anti-fouling composition comprising polyether and 1, 2-dihydroxybenzene was injected into the bottom stream 23, and then the bottom stream 23 was fed to the oxygenate recovery column 30. The performance of the anti-fouling composition was evaluated by trend data during the second test and data generated during the first test.
Fig. 2 depicts the outlet temperature of reboiler 33 as a function of time. Fig. 2 shows that the outlet temperature of reboiler 33 remains stable over a long period of time, indicating that the anti-fouling composition is effective in controlling deposit formation and/or accumulation.
Fig. 3 depicts the overhead pressure of the oxygenate recovery tower 30 as a function of time. The overhead pressure is proportional to the amount of oxygenate recovered from the overhead. As shown in fig. 3, during the second test, the overhead pressure of the oxygenate recovery tower remained significantly stable when the anti-fouling composition was used and was higher than the overhead pressure measured during the first test when the anti-fouling composition was not used. The results indicate that more oxygenates are recovered and that the formation and/or accumulation of deposits in the oxygenate recovery tower is effectively controlled by the anti-fouling agent.
FIG. 4 depicts pressure differential versus time for a methanol recovery column. As shown in fig. 4, the differential pressure of the oxygenate recovery tower fluctuates during the test 1 period prior to the use of the anti-fouling composition, and becomes relatively stable after the use of the anti-fouling composition during the test 2 period, indicating that the anti-fouling composition as disclosed herein is effective in controlling deposit formation and accumulation. The column performance is improved.
Fig. 5 depicts the outlet temperature of the wastewater exiting heat exchanger 34 as a function of time. Fig. 5 shows that during test 2, the wastewater outlet temperature was relatively low when the anti-fouling composition was used, indicating that chemical treatment can significantly reduce deposit formation and/or accumulation.
Various embodiments of the present disclosure are given below.
Embodiment 1. A method of reducing deposit formation, accumulation, or a combination thereof in an oxygenate to olefin process, the method comprising: adding an anti-fouling composition to a reactor effluent stream comprising olefins, unreacted oxygenates, and water; a quench tower; a bottoms stream from the quench tower; recovering the oxygen-containing compound; or a combination thereof, wherein the anti-fouling composition comprises a dispersant, an inhibitor, or a combination thereof, the dispersant comprising a polyether, a fatty acid amide, an organic sulfonic acid compound, or a combination comprising at least one of the foregoing; and the inhibitor includes a hydroxybenzene.
Wherein each occurrence of R is independently C 1-10 Alkyl, C 5-12 Aryl group,Amino or carboxylate groups; and m is 0 to 4.
Embodiment 3. The method of embodiment 2, wherein m is zero.
Embodiment 5 the method of any of embodiments 1-4, wherein the anti-fouling composition comprises a fatty acid amide having the formula
Wherein R is 1 And R is 2 Independently C 1-4 An alkyl group, and R 3 Is C 9-30 Alkyl or C 9-30 An alkenyl group.
Embodiment 8. The method of embodiment 7 wherein the anti-fouling composition comprises a polyether and 1, 2-dihydroxybenzene.
Embodiment 9. The method of embodiment 7 or embodiment 8, wherein the weight ratio of dispersant to inhibitor is from about 1:10 to about 10:1.
Embodiment 12. The method of any of embodiments 1-11, wherein the oxygenate comprises methanol, dimethyl ether, or a combination thereof.
Embodiment 13. The method of any of embodiments 1-12, wherein the olefin comprises polyethylene, polypropylene, or a combination comprising at least one of the foregoing.
Embodiment 19. The method of any of embodiments 15-18, wherein the anti-fouling composition comprises a dispersant and an inhibitor.
All ranges disclosed herein are inclusive of the endpoints, and the endpoints are independently combinable with each other. As used herein, "combination" includes blends, mixtures, alloys, reaction products, and the like. All documents are incorporated herein by reference.
The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. "or" means "and/or". The modifier "about" used in connection with a quantity is inclusive of the stated value and has the meaning dictated by the context (e.g., it includes determining the degree of error associated with the particular quantity).
Claims (10)
1. A method of reducing deposit formation, accumulation, or a combination thereof in an oxygenate to olefin process, the method characterized by:
adding an anti-fouling composition to
A reactor effluent stream (12) comprising olefins, unreacted oxygenates and water;
a quench tower (20);
a bottom stream (23) from the quench tower (20);
an oxygenate recovery tower (30); or (b)
A combination thereof;
wherein the anti-fouling composition comprises a dispersant and an inhibitor,
the dispersant comprises a polyether; and
the inhibitor comprises a hydroxybenzene having the formula
Wherein each occurrence of R is independently C 1-10 Alkyl, C 5-12 Aryl, amino or carboxylate groups; and
m is 0-4; and
the weight ratio of the dispersing agent to the inhibitor is 1:10-10:1.
2. The method of claim 1, wherein m is zero.
3. The method of claim 1, wherein the anti-fouling composition comprises a polyether that is polyethylene glycol, polypropylene glycol, polyethylene polypropylene glycol, or a combination comprising at least one of the foregoing.
4. The method of claim 1, wherein the anti-fouling composition comprises a polyether and 1, 2-dihydroxybenzene.
5. The method of claim 1, wherein the anti-fouling composition is added to the bottom stream from a quench tower, which is then fed to an oxygenate recovery tower.
6. The method of claim 5, wherein the anti-fouling composition is present in a volume ratio of 1:1,000,000-1:1,000 relative to the bottoms stream from the quench tower.
7. The method of claim 1, wherein the olefin comprises polyethylene, polypropylene, or a combination comprising at least one of the foregoing.
8. A method of recovering unreacted oxygenate with reduced deposit formation, accumulation, or a combination thereof, the method characterized by:
passing the reactor effluent stream (12) comprising olefins, unreacted oxygenates and water to a quench tower (20) to produce an overhead stream (22) comprising olefins and a bottoms stream (23) comprising unreacted oxygenates and water;
adding an anti-fouling composition to
The reactor effluent stream (12),
the quenching tower (20),
said bottom stream (23) from the quench tower (20),
an oxygenate recovery tower (30), or
A combination thereof; and
separating the unreacted oxygenate from water in the oxygenate recovery tower (30),
wherein the anti-fouling composition comprises a dispersant and an inhibitor,
the dispersant comprises a polyether; and
the inhibitor comprises a hydroxybenzene having the formula
Wherein each occurrence of R is independently C 1-10 Alkyl, C 5-12 Aryl, amino or carboxylate groups; and
m is 0-4; and
the weight ratio of the dispersing agent to the inhibitor is 1:10-10:1.
9. The method as recited in claim 8, further characterized by:
withdrawing a stream from a lower portion of the oxygenate recovery tower (30), the withdrawn stream comprising unreacted oxygenate and water;
heating the withdrawn stream using a reboiler (33) to provide a heated stream; and
returning the heated stream to the oxygenate recovery tower (30);
wherein the reboiler (33) has improved efficiency compared to the same reboiler used for a reference process without the anti-fouling composition.
10. A process for producing olefins from recycled oxygenates with reduced deposit formation, accumulation or a combination thereof, said process characterized by:
reacting the recycled oxygenate (32) in the presence of a catalyst in an oxygenate to olefin reactor (10) to produce a reactor effluent stream (12) comprising olefins, unreacted oxygenate and water;
passing the reactor effluent stream (12) to a quench column (20) to produce an overhead stream (22) comprising olefins and a bottoms stream (23) comprising unreacted oxygenates and water;
separating the unreacted oxygenate from water in an oxygenate recovery tower (30) to provide the recycled oxygenate (32); and
adding an anti-fouling composition to
The reactor effluent stream (12),
the quenching tower (20),
said bottom stream (23) from the quench tower (20),
the oxygenate recovery tower (30), or
A combination thereof; and
the unreacted oxygenate is separated from the water,
wherein the anti-fouling composition comprises a dispersant and an inhibitor,
the dispersant comprises a polyether; and
the inhibitor comprises a hydroxybenzene having the formula
Wherein each occurrence of R is independently C 1-10 Alkyl, C 5-12 Aryl, amino or carboxylate groups; and
m is 0-4; and
the weight ratio of the dispersing agent to the inhibitor is 1:10-10:1.
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| CN106745857A (en) * | 2016-12-13 | 2017-05-31 | 天津市瑞德赛恩新材料开发有限公司 | A kind of water scrubber dirt dispersion agent and its application method |
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| CN105712816A (en) * | 2014-12-18 | 2016-06-29 | 乔治·克劳德方法的研究开发空气股份有限公司 | Plant And Process For Producing Propylene From Methanol |
| CN106467448A (en) * | 2015-08-20 | 2017-03-01 | 中国石油化工股份有限公司 | For the alkene polymerization inhibitor in methanol-to-olefins device caustic wash tower |
| CN105819578A (en) * | 2016-04-16 | 2016-08-03 | 浙江杭化科技有限公司 | Scale removing agent used for MTO (Methanol To Olefins) water scrubber |
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